The magneto-dielectric properties of compounds and alloys in the systems of TlInS2-TlFeS2, TlInS2-TlFeSe2

Abstract

The research of dielectric properties of TlInS2-layered compound shows that TlInS2 is extrinsic ferroelectric (T-c approximate to 202.4 K) with intermediate incommensurable phase (T-i approximate to 206.3 K). Analysis of publications was carried out by us on magnetic properties of TlFeS2 and TlFeSe2 compounds, having chained crystalline structure, allows to draw a conclusion that these compounds are highly anisotropic (quasione-dimensional) antiferromagnets with Neel temperatures equal to similar to 12 K and similar to 14 K respectively (long-range magnetic order). Moreover, on the temperature dependence of reverse magnetic susceptibility TlFeS2 and TlFeSe2 in paramagnetic area at 196 K and 290 K respectively, wide minimums exist, which characterize short-range magnetic order in these quasi-one-dimensional antiferromagnets. Using method of differential-thermal analysis were founded regions of homogenous and heterogeneous co-existence of ferroelectric and antiferromagnetic orderings in the systems of TlInS2-TlFeS2 and TlInS2-TlFeSe2. (C) 2010 Elsevier B.V. All rights reserved.